corrected typo in isomorphismTest.py
corrected typo in isomorphismTest.py

pierrelb/RMG-Py,pierrelb/RMG-Py,enochd/RMG-Py,chatelak/RMG-Py,nyee/RMG-Py,nyee/RMG-Py,chatelak/RMG-Py,nickvandewiele/RMG-Py,enochd/RMG-Py,nickvandewiele/RMG-Py,comocheng/RMG-Py,comocheng/RMG-Py